Brake, drive train, or wheel issue? Low or higher speed driving, going straight or turning, vehicle emits a high pitched, (VERY loud in parking garages, but can hear it when a vehicle comes next to vehicle on the road, as well), metal-on-metal sounding squeal. When depressing brake the noise is louder. When turning the steering wheel left or right, the noise is louder. Noise is constant – but louder when performing steering or braking actions.

Constant, metallic, and varying with steering and braking sounds like it could be a serpentine belt idler pulley, although I couldn't say for sure over the internet. You could also see if the noise changes at all when you turn the air conditioning on and off, could be the AC compressor clutch, but that usually starts happening after 10 years of rust. Either way, I'd take it in and have it fixed under warranty.

Zee19969 and cww516: Took it in to the dealer and dropped it off. Definitely under warranty and I purchased the Subaru extended warranty when I purchased it new. Fingers crossed ... had to have the wheel bearing replaced at about 7,000 miles. Don't like this 'weirdness' happening to a new car.

I've heard a similar noise one night driving home after a long highway drive, 200 miles, I'm curious to know what the dealer says as I've given a look all around and didnt notice anything that looked off and noise has never come back.

I received my 2013 Legacy back from the dealership yesterday. They could not locate any issues. The final outcome was that it must have been a rock or something in one of the brake calipers that worked its way out.

I also found out that, prior to buying my Legacy (brand new at a Subaru dealership), it had a wheel bearing replaced. This was not disclosed at the time of purchase (sigh). They verified the repair was performed correctly, and torqued some bolts.

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I received my 2013 Legacy back from the dealership yesterday. They could not locate any issues. The final outcome was that it must have been a rock or something in one of the brake calipers that worked its way out.

I also found out that, prior to buying my Legacy (brand new at a Subaru dealership), it had a wheel bearing replaced. This was not disclosed at the time of purchase (sigh). They verified the repair was performed correctly, and torqued some bolts.

It's possible to get a pebble in the caliper or behind the inner rotor brake shield that would cause a squealing.